Numbness in hand radiating to entire arm, history of transverse myelitis. What should be done?

i had an attack of transverse myelitus 2 years back that spread in asending manner from legs to T2 level ,i got treatment with solumedrol and recovered 80%.now from last 2 days i have numbness in my left hand(thinar and hypothinar muscles) and today it involves whole arm unilateral.please tell me what should i do now? is it myelitus again?